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Finding the Fourth Proportional to 20,420.64, 30,630.64 and 11,181.60

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Solution

The fourth proportional to 20,420.64, 30,630.64 and 11,181.60 is: 16,772.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.64 : 30,630.64 = 11,181.60 : x
  2. Step 2: Convert to fraction form
    20,420.64/30,630.64 = 11,181.60/x
  3. Step 3: Cross multiply
    20,420.64x = 30,630.64 × 11,181.60
  4. Step 4: Simplify right side
    20,420.64x = 342,499,564.22
  5. Step 5: Solve for x
    x = 342,499,564.22/20,420.64
  6. Step 6: Final answer
    x = 16,772.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.